// 导入http模块:
const http = require('http')

// 创建http server，并传入回调函数:
const server = http.createServer((request, response) => {
  // 回调函数接收request和response对象,
  // 获得HTTP请求的method和url:
  console.log(request.method + ': ' + request.url)
  // 将HTTP响应200写入response, 同时设置Content-Type: text/html:
  response.writeHead(200, {'Content-Type': 'text/html'})
  // 将HTTP响应的HTML内容写入response:
  response.end('<h1>Hello world!</h1>')
})

// 让服务器监听8080端口:
server.listen(8080)

console.log('Server is running at http://127.0.0.1:8080/')